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Table 2 Characteristics of the nine participating hospitals and number of medical records extracted at each hospital

From: Internal validity of the Swedish Maternal Health Care Register

City Participating hospital Level of health care Inhabitants/km22011a No. of births 2011b(%)c No. of medical records (%)d
Göteborg Sahlgrenska University Hospital University 66.8 10363 (9.4) 91 (10.4)
Halmstad Halmstad Hospital County 55.6 1799 (1.6) 96 (10.9)
Jönköping Ryhov Hospital County 32.4 2075 (1.9) 99 (11.3)
Stockholm Karolinska University Hospital University 320.5 4642 (4.2) 96 (10.9)
Stockholm Södersjukhuset University 320.5 7331 (6.7) 98 (11.2)
Sundsvall Sundsvall Hospital Regional 11.2 1536 (1.4) 100 (11.4)
Umeå Umeå University Hospital University 4.7 1817 (1.6) 100 (11.4)
Örebro Örebro University Hospital University 33.1 2867 (2.6) 99 (11.3)
Östersund Östersund Hospital Regional 2.6 1298 (1.2) 99 (11.3)
     30728 (28.0) 878 (100%)
  1. aPopulation density in catchment area. Data from “Inhabitants per kilometer2” [Internet] Statistics Sweden; 2011 (cited 2013, June 6) http://www.scb.se/Pages/SSD/SSD_SelectVariables340487.aspx?px_tableid = ssd_extern%3aBefArealTathetKon&rxid = ca8cabdd-0d60-488b-b047-4b5c5a89dcb5.
  2. bData from National Board of Health and Welfare’Graviditeter, förlossningar och nyfödda barn. Medicinska Födelseregistret 1973-2011. Assisterad befruktning 1991 – 2010’ [in Swedish] http://www.socialstyrelsen.se/publikationer2013/2013-3-27.
  3. cProportions are calculated by using the total no of births in Sweden 2011 (N = 109 752) as denominator.
  4. dProportions are calculated by using the total no of medical records as denominator.